1 files changed, 213 insertions, 74 deletions

diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c
index bde3550910a2..d9a0143e1d3a 100644
--- a/drivers/mtd/nand/au1550nd.c
+++ b/drivers/mtd/nand/au1550nd.c
@@ -14,6 +14,7 @@
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/interrupt.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
@@ -38,22 +39,20 @@
  */
 static struct mtd_info *au1550_mtd = NULL;
 static void __iomem *p_nand;
-static int nand_width = 1; /* default x8*/
+static int nand_width = 1;	/* default x8 */
 
 /*
  * Define partitions for flash device
  */
 static const struct mtd_partition partition_info[] = {
 	{
-		.name 	= "NAND FS 0",
-	  	.offset = 0,
-	  	.size 	= 8*1024*1024
-	},
+	 .name = "NAND FS 0",
+	 .offset = 0,
+	 .size = 8 * 1024 * 1024},
 	{
-		.name 	= "NAND FS 1",
-		.offset =  MTDPART_OFS_APPEND,
- 		.size 	=    MTDPART_SIZ_FULL
-	}
+	 .name = "NAND FS 1",
+	 .offset = MTDPART_OFS_APPEND,
+	 .size = MTDPART_SIZ_FULL}
 };
 
 /**
@@ -157,7 +156,7 @@ static void au_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 	int i;
 	struct nand_chip *this = mtd->priv;
 
-	for (i=0; i<len; i++) {
+	for (i = 0; i < len; i++) {
 		writeb(buf[i], this->IO_ADDR_W);
 		au_sync();
 	}
@@ -176,7 +175,7 @@ static void au_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 	int i;
 	struct nand_chip *this = mtd->priv;
 
-	for (i=0; i<len; i++) {
+	for (i = 0; i < len; i++) {
 		buf[i] = readb(this->IO_ADDR_R);
 		au_sync();
 	}
@@ -195,7 +194,7 @@ static int au_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
 	int i;
 	struct nand_chip *this = mtd->priv;
 
-	for (i=0; i<len; i++) {
+	for (i = 0; i < len; i++) {
 		if (buf[i] != readb(this->IO_ADDR_R))
 			return -EFAULT;
 		au_sync();
@@ -219,7 +218,7 @@ static void au_write_buf16(struct mtd_info *mtd, const u_char *buf, int len)
 	u16 *p = (u16 *) buf;
 	len >>= 1;
 
-	for (i=0; i<len; i++) {
+	for (i = 0; i < len; i++) {
 		writew(p[i], this->IO_ADDR_W);
 		au_sync();
 	}
@@ -241,7 +240,7 @@ static void au_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
 	u16 *p = (u16 *) buf;
 	len >>= 1;
 
-	for (i=0; i<len; i++) {
+	for (i = 0; i < len; i++) {
 		p[i] = readw(this->IO_ADDR_R);
 		au_sync();
 	}
@@ -262,7 +261,7 @@ static int au_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len)
 	u16 *p = (u16 *) buf;
 	len >>= 1;
 
-	for (i=0; i<len; i++) {
+	for (i = 0; i < len; i++) {
 		if (p[i] != readw(this->IO_ADDR_R))
 			return -EFAULT;
 		au_sync();
@@ -275,27 +274,35 @@ static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
 {
 	register struct nand_chip *this = mtd->priv;
 
-	switch(cmd){
+	switch (cmd) {
+
+	case NAND_CTL_SETCLE:
+		this->IO_ADDR_W = p_nand + MEM_STNAND_CMD;
+		break;
 
-	case NAND_CTL_SETCLE: this->IO_ADDR_W = p_nand + MEM_STNAND_CMD; break;
-	case NAND_CTL_CLRCLE: this->IO_ADDR_W = p_nand + MEM_STNAND_DATA; break;
+	case NAND_CTL_CLRCLE:
+		this->IO_ADDR_W = p_nand + MEM_STNAND_DATA;
+		break;
+
+	case NAND_CTL_SETALE:
+		this->IO_ADDR_W = p_nand + MEM_STNAND_ADDR;
+		break;
 
-	case NAND_CTL_SETALE: this->IO_ADDR_W = p_nand + MEM_STNAND_ADDR; break;
 	case NAND_CTL_CLRALE:
 		this->IO_ADDR_W = p_nand + MEM_STNAND_DATA;
-		/* FIXME: Nobody knows why this is neccecary,
+		/* FIXME: Nobody knows why this is necessary,
 		 * but it works only that way */
 		udelay(1);
 		break;
 
 	case NAND_CTL_SETNCE:
 		/* assert (force assert) chip enable */
-		au_writel((1<<(4+NAND_CS)) , MEM_STNDCTL); break;
+		au_writel((1 << (4 + NAND_CS)), MEM_STNDCTL);
 		break;
 
 	case NAND_CTL_CLRNCE:
- 		/* deassert chip enable */
-		au_writel(0, MEM_STNDCTL); break;
+		/* deassert chip enable */
+		au_writel(0, MEM_STNDCTL);
 		break;
 	}
 
@@ -312,69 +319,200 @@ int au1550_device_ready(struct mtd_info *mtd)
 	return ret;
 }
 
+/**
+ * au1550_select_chip - control -CE line
+ *	Forbid driving -CE manually permitting the NAND controller to do this.
+ *	Keeping -CE asserted during the whole sector reads interferes with the
+ *	NOR flash and PCMCIA drivers as it causes contention on the static bus.
+ *	We only have to hold -CE low for the NAND read commands since the flash
+ *	chip needs it to be asserted during chip not ready time but the NAND
+ *	controller keeps it released.
+ *
+ * @mtd:	MTD device structure
+ * @chip:	chipnumber to select, -1 for deselect
+ */
+static void au1550_select_chip(struct mtd_info *mtd, int chip)
+{
+}
+
+/**
+ * au1550_command - Send command to NAND device
+ * @mtd:	MTD device structure
+ * @command:	the command to be sent
+ * @column:	the column address for this command, -1 if none
+ * @page_addr:	the page address for this command, -1 if none
+ */
+static void au1550_command(struct mtd_info *mtd, unsigned command, int column, int page_addr)
+{
+	register struct nand_chip *this = mtd->priv;
+	int ce_override = 0, i;
+	ulong flags;
+
+	/* Begin command latch cycle */
+	this->hwcontrol(mtd, NAND_CTL_SETCLE);
+	/*
+	 * Write out the command to the device.
+	 */
+	if (command == NAND_CMD_SEQIN) {
+		int readcmd;
+
+		if (column >= mtd->oobblock) {
+			/* OOB area */
+			column -= mtd->oobblock;
+			readcmd = NAND_CMD_READOOB;
+		} else if (column < 256) {
+			/* First 256 bytes --> READ0 */
+			readcmd = NAND_CMD_READ0;
+		} else {
+			column -= 256;
+			readcmd = NAND_CMD_READ1;
+		}
+		this->write_byte(mtd, readcmd);
+	}
+	this->write_byte(mtd, command);
+
+	/* Set ALE and clear CLE to start address cycle */
+	this->hwcontrol(mtd, NAND_CTL_CLRCLE);
+
+	if (column != -1 || page_addr != -1) {
+		this->hwcontrol(mtd, NAND_CTL_SETALE);
+
+		/* Serially input address */
+		if (column != -1) {
+			/* Adjust columns for 16 bit buswidth */
+			if (this->options & NAND_BUSWIDTH_16)
+				column >>= 1;
+			this->write_byte(mtd, column);
+		}
+		if (page_addr != -1) {
+			this->write_byte(mtd, (u8)(page_addr & 0xff));
+
+			if (command == NAND_CMD_READ0 ||
+			    command == NAND_CMD_READ1 ||
+			    command == NAND_CMD_READOOB) {
+				/*
+				 * NAND controller will release -CE after
+				 * the last address byte is written, so we'll
+				 * have to forcibly assert it. No interrupts
+				 * are allowed while we do this as we don't
+				 * want the NOR flash or PCMCIA drivers to
+				 * steal our precious bytes of data...
+				 */
+				ce_override = 1;
+				local_irq_save(flags);
+				this->hwcontrol(mtd, NAND_CTL_SETNCE);
+			}
+
+			this->write_byte(mtd, (u8)(page_addr >> 8));
+
+			/* One more address cycle for devices > 32MiB */
+			if (this->chipsize > (32 << 20))
+				this->write_byte(mtd, (u8)((page_addr >> 16) & 0x0f));
+		}
+		/* Latch in address */
+		this->hwcontrol(mtd, NAND_CTL_CLRALE);
+	}
+
+	/*
+	 * Program and erase have their own busy handlers.
+	 * Status and sequential in need no delay.
+	 */
+	switch (command) {
+
+	case NAND_CMD_PAGEPROG:
+	case NAND_CMD_ERASE1:
+	case NAND_CMD_ERASE2:
+	case NAND_CMD_SEQIN:
+	case NAND_CMD_STATUS:
+		return;
+
+	case NAND_CMD_RESET:
+		break;
+
+	case NAND_CMD_READ0:
+	case NAND_CMD_READ1:
+	case NAND_CMD_READOOB:
+		/* Check if we're really driving -CE low (just in case) */
+		if (unlikely(!ce_override))
+			break;
+
+		/* Apply a short delay always to ensure that we do wait tWB. */
+		ndelay(100);
+		/* Wait for a chip to become ready... */
+		for (i = this->chip_delay; !this->dev_ready(mtd) && i > 0; --i)
+			udelay(1);
+
+		/* Release -CE and re-enable interrupts. */
+		this->hwcontrol(mtd, NAND_CTL_CLRNCE);
+		local_irq_restore(flags);
+		return;
+	}
+	/* Apply this short delay always to ensure that we do wait tWB. */
+	ndelay(100);
+
+	while(!this->dev_ready(mtd));
+}
+
+
 /*
  * Main initialization routine
  */
-int __init au1xxx_nand_init (void)
+static int __init au1xxx_nand_init(void)
 {
 	struct nand_chip *this;
-	u16 boot_swapboot = 0; /* default value */
+	u16 boot_swapboot = 0;	/* default value */
 	int retval;
 	u32 mem_staddr;
 	u32 nand_phys;
 
 	/* Allocate memory for MTD device structure and private data */
-	au1550_mtd = kmalloc (sizeof(struct mtd_info) +
-			sizeof (struct nand_chip), GFP_KERNEL);
+	au1550_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 	if (!au1550_mtd) {
-		printk ("Unable to allocate NAND MTD dev structure.\n");
+		printk("Unable to allocate NAND MTD dev structure.\n");
 		return -ENOMEM;
 	}
 
 	/* Get pointer to private data */
-	this = (struct nand_chip *) (&au1550_mtd[1]);
+	this = (struct nand_chip *)(&au1550_mtd[1]);
 
 	/* Initialize structures */
-	memset((char *) au1550_mtd, 0, sizeof(struct mtd_info));
-	memset((char *) this, 0, sizeof(struct nand_chip));
+	memset(au1550_mtd, 0, sizeof(struct mtd_info));
+	memset(this, 0, sizeof(struct nand_chip));
 
 	/* Link the private data with the MTD structure */
 	au1550_mtd->priv = this;
+	au1550_mtd->owner = THIS_MODULE;
 
 
-	/* disable interrupts */
-	au_writel(au_readl(MEM_STNDCTL) & ~(1<<8), MEM_STNDCTL);
-
-	/* disable NAND boot */
-	au_writel(au_readl(MEM_STNDCTL) & ~(1<<0), MEM_STNDCTL);
+	/* MEM_STNDCTL: disable ints, disable nand boot */
+	au_writel(0, MEM_STNDCTL);
 
 #ifdef CONFIG_MIPS_PB1550
 	/* set gpio206 high */
-	au_writel(au_readl(GPIO2_DIR) & ~(1<<6), GPIO2_DIR);
+	au_writel(au_readl(GPIO2_DIR) & ~(1 << 6), GPIO2_DIR);
 
-	boot_swapboot = (au_readl(MEM_STSTAT) & (0x7<<1)) |
-		((bcsr->status >> 6)  & 0x1);
+	boot_swapboot = (au_readl(MEM_STSTAT) & (0x7 << 1)) | ((bcsr->status >> 6) & 0x1);
 	switch (boot_swapboot) {
-		case 0:
-		case 2:
-		case 8:
-		case 0xC:
-		case 0xD:
-			/* x16 NAND Flash */
-			nand_width = 0;
-			break;
-		case 1:
-		case 9:
-		case 3:
-		case 0xE:
-		case 0xF:
-			/* x8 NAND Flash */
-			nand_width = 1;
-			break;
-		default:
-			printk("Pb1550 NAND: bad boot:swap\n");
-			retval = -EINVAL;
-			goto outmem;
+	case 0:
+	case 2:
+	case 8:
+	case 0xC:
+	case 0xD:
+		/* x16 NAND Flash */
+		nand_width = 0;
+		break;
+	case 1:
+	case 9:
+	case 3:
+	case 0xE:
+	case 0xF:
+		/* x8 NAND Flash */
+		nand_width = 1;
+		break;
+	default:
+		printk("Pb1550 NAND: bad boot:swap\n");
+		retval = -EINVAL;
+		goto outmem;
 	}
 #endif
 
@@ -424,18 +562,20 @@ int __init au1xxx_nand_init (void)
 
 	/* make controller and MTD agree */
 	if (NAND_CS == 0)
-		nand_width = au_readl(MEM_STCFG0) & (1<<22);
+		nand_width = au_readl(MEM_STCFG0) & (1 << 22);
 	if (NAND_CS == 1)
-		nand_width = au_readl(MEM_STCFG1) & (1<<22);
+		nand_width = au_readl(MEM_STCFG1) & (1 << 22);
 	if (NAND_CS == 2)
-		nand_width = au_readl(MEM_STCFG2) & (1<<22);
+		nand_width = au_readl(MEM_STCFG2) & (1 << 22);
 	if (NAND_CS == 3)
-		nand_width = au_readl(MEM_STCFG3) & (1<<22);
-
+		nand_width = au_readl(MEM_STCFG3) & (1 << 22);
 
 	/* Set address of hardware control function */
 	this->hwcontrol = au1550_hwcontrol;
 	this->dev_ready = au1550_device_ready;
+	this->select_chip = au1550_select_chip;
+	this->cmdfunc = au1550_command;
+
 	/* 30 us command delay time */
 	this->chip_delay = 30;
 	this->eccmode = NAND_ECC_SOFT;
@@ -454,7 +594,7 @@ int __init au1xxx_nand_init (void)
 	this->verify_buf = (!nand_width) ? au_verify_buf16 : au_verify_buf;
 
 	/* Scan to find existence of the device */
-	if (nand_scan (au1550_mtd, 1)) {
+	if (nand_scan(au1550_mtd, 1)) {
 		retval = -ENXIO;
 		goto outio;
 	}
@@ -465,10 +605,10 @@ int __init au1xxx_nand_init (void)
 	return 0;
 
  outio:
-	iounmap ((void *)p_nand);
+	iounmap((void *)p_nand);
 
  outmem:
-	kfree (au1550_mtd);
+	kfree(au1550_mtd);
 	return retval;
 }
 
@@ -477,22 +617,21 @@ module_init(au1xxx_nand_init);
 /*
  * Clean up routine
  */
-#ifdef MODULE
-static void __exit au1550_cleanup (void)
+static void __exit au1550_cleanup(void)
 {
-	struct nand_chip *this = (struct nand_chip *) &au1550_mtd[1];
+	struct nand_chip *this = (struct nand_chip *)&au1550_mtd[1];
 
 	/* Release resources, unregister device */
-	nand_release (au1550_mtd);
+	nand_release(au1550_mtd);
 
 	/* Free the MTD device structure */
-	kfree (au1550_mtd);
+	kfree(au1550_mtd);
 
 	/* Unmap */
-	iounmap ((void *)p_nand);
+	iounmap((void *)p_nand);
 }
+
 module_exit(au1550_cleanup);
-#endif
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Embedded Edge, LLC");